algod API: Remove errant base64 docs reference

[michaeldiamant]

Removes an errant base64 docs reference introduced in #3908 that was noticed in algorand/go-algorand-sdk#316 (comment).

[michaeldiamant]

Forgot to mention in description - Generated diffs created via make -C daemon/algod/api/ generate.

[jasonpaulos]

Changes look good

[codecov]

Codecov Report

Merging #3982 (36746fa) into master (aa82b9a) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3982      +/-   ##
==========================================
+ Coverage   49.76%   49.78%   +0.01%     
==========================================
  Files         409      409              
  Lines       69157    69157              
==========================================
+ Hits        34419    34431      +12     
+ Misses      31014    31005       -9     
+ Partials     3724     3721       -3     

Impacted Files	Coverage Δ
ledger/roundlru.go	90.56% <0.00%> (-5.67%)	⬇️
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
ledger/tracker.go	70.56% <0.00%> (-2.60%)	⬇️
data/transactions/verify/txn.go	44.15% <0.00%> (-0.87%)	⬇️
network/wsNetwork.go	62.99% <0.00%> (+0.19%)	⬆️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
catchup/service.go	70.12% <0.00%> (+1.23%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
crypto/merkletrie/trie.go	68.61% <0.00%> (+2.18%)	⬆️
util/metrics/counter.go	88.50% <0.00%> (+2.29%)	⬆️
... and 2 more

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[algochoi]

thanks for the fix!